Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f31c6a56d4a5994…

MALICIOUS

PDF

88.3 KB Created: 2021-07-01 13:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2793f85529b5a846b0f5995cb2545027 SHA-1: 0d617bc3b2e9b308efc8f16ec42688313bdb6f4f SHA-256: 8f31c6a56d4a5994d42df6a102642c111bdee234a1d2acf689ddadbd807506ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or initiating malicious actions. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or distribute payloads through various channels. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/1216688aecd1c0f37ea7ef43f20d368a/jelukepefarutavem.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/pikarazi.pdf
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/28814815707.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/2c79969e3717592fc8cdf0336c6b70bb/datozukitajibulexu.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab15924d78---fagif.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abfec8eb12---84474140018.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/b8jkk2nbq8n8kvirro80t1jiur/3546645541.pdf
    • https://imahima.xyz/js/ckfinder/userfiles/files/ropinox.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/b4df1c5d60cd7eda9526ce11bf6261e2/sokigixepa.pdf
    • http://doyen.cc/images/upload/File/72131686174.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab06ff7c40d---9170965467.pdf
    • http://adabaskimerkezi.com/upload/file/11934949636.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e2039d062---salebijufivuloxonomefoja.pdf
    • http://mariopresto.pl/userfiles/file/fewuleropixiru.pdf
    • https://egf.tw/test2/images/file/metipoveruw.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f936251741c5420ef9f2317ff5a1894c/zajavafi.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/58nje5gl5jno8sd939chdd1p3p/87697772897.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9da7a08c04---devafaxosefuzul.pdf
    • http://drapa-technika.cz/UserFiles/File/81507462829.pdf
    • http://mamtomchabahai.com/uploads/files/files/gomeko.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/51154a4acd7a25bf2acc9a8d3041c240/kenozadeladuterereka.pdf
    • http://ruihuitax.com/files/file/79625880477.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hope+you+have+a+quick+recovery
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f444.bin
966824317919fd2fb0de96765512b4093f3df0f65aeb96998b28fe91572cbae5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF444 10564 bytes
font_01_sfnt_off00010c78.bin
94d0b1e9381fa34861f002bdb537402d260b2a801561cd998fa521185b998425
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C78 17512 bytes
font_02_sfnt_off00013a6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6F 16792 bytes